Which phone sensor is commonly used to track physical activity for health apps?

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Multiple Choice

Which phone sensor is commonly used to track physical activity for health apps?

Movement sensing for health apps relies on the accelerometer because it captures linear motion across three axes, which directly reflects how the body moves when walking, running, or performing daily activities. By analyzing the acceleration signals—looking at patterns, frequency, and peaks—the app can detect steps, estimate pace, and gauge overall activity and energy expenditure. The accelerometer is specifically designed to measure movement, making it the most effective sensor for tracking physical activity. Gyroscopes track rotation, which isn’t essential for basic activity counting. Magnetometers measure orientation relative to Earth's magnetic field, not movement. Proximity sensors detect how close the phone is to nearby objects, which isn’t related to activity tracking.

Movement sensing for health apps relies on the accelerometer because it captures linear motion across three axes, which directly reflects how the body moves when walking, running, or performing daily activities. By analyzing the acceleration signals—looking at patterns, frequency, and peaks—the app can detect steps, estimate pace, and gauge overall activity and energy expenditure. The accelerometer is specifically designed to measure movement, making it the most effective sensor for tracking physical activity.

Gyroscopes track rotation, which isn’t essential for basic activity counting. Magnetometers measure orientation relative to Earth's magnetic field, not movement. Proximity sensors detect how close the phone is to nearby objects, which isn’t related to activity tracking.

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